Bit attachment for augers



Aug. 28, 1923. I 1,466,378

F. M LAUGHLIN I BIT ATTACHMENT FOR AUGERS Filed April 18 1921 PatentedAug. 28, l923.

UNITE STAS FRED MOLAUGHLIN, OF CANTON, ILLINOIS.

BIT ATTACHMENT FOR AUGERS.

Application filed April 18, 1921.- Serial No. 462,238.

To all whom it may concern:

Be it known that I, FRED MCLAUGHLIN, a citizen of the United States,residing at Canton, in the county of Fulton and State of Illinois, haveinvented certain new and useful Improvements in Bit Attachments forAngers, of which the following is a specification.

This invention relates to angers, and pertains especially to the classof angers employed for drilling holes in coal-mining veins preparatoryto blasting.

The object of the invention is to provide a novel and peculiar bitadapted to be detachably secured to such angers in boring positionwithout the use of the usual screwend or entrance tip, and to furnishsuch means for attaching the bit as to afford rigid connection betweenthe auger end and the bit without interfering with the operation of theauger and the bit in a drilling operation.

A further object of theinvention is to provide a bit specially adaptedfor minedrilling angers and comprising two duplicate separable membersof such construction relative to each other and to the shape of theanger as to fit the latter and to form diverging cutting members havingan abutting shoulder for the end of the auger, and to provide means forrigidly holding said members in such abutting position so as to crosseach other central of the end of the au er to which they are secured.

arious other ObJfiCtS, advantages and improved results are attainable inthe manufactnre and practical application of the invention as willhereinafter appear.

In the accompanying drawings forming part of this application Fig. 1 isan elevation of part of an anger showing the bit secured thereto indrilling position.

Fig. 2 is a cross section taken on the dotted line 2-2 Fig. 1.

Fig. 3 is a detail perspective View of the bit members, in position tobe applied to an anger.

Fig. 4 is a detail view showing a modification.

The same reference characters denote the same parts throughout theseveral views of the drawin s.

In carrying out my invention, I preferably employ steel plates capableof being shaped 1nto desired form, sharpened an case-hardenedpreparatory to applying the same to a mlners auger 3, such as shown inthe drawings, or any other anger of similar character.

The bit I have devised comprises two companion duplicate interchangeablemembers and 5, and for this reason only one of said members will bedescribed herein in detail, it being understood that such de 65scriptlon shall e applicable to both of said members which, whenassembled and attached to an anger as 3, shall constitute the completebit.

The auger-fitting portion or wing 6 of the b1t member 4.- is formed inconvex concave shape to fit the spiral groove and web of the auger sothat when the members are assembled in proper position they embrace theauger for a distance vertically from the end to which said members areapplied, and follow the shape or contour of the auger and thereby form acontinuation of the spiral shape of the auger. The lower portion of thewing 6 is divided into an edge as 7 and a shoulder 8 at right angles tothe inner face of the member 6, and from this shoulder projects ordepends a blade 9 havmg a heel edge 10 and a beveled cutting edge 11.The blade is convexed concaved and the cutting edge is inclineddownwardly with respect to the head portion 6 and extends under theshoulder to an outer point 12, the lower edge of the blade being joinedin a point 13 with the blade heel which crosses the central verticalplane of the auger when the members are secured tothe anger and in suchsecured position the heels cross each other in the central verticalplane of the auger, so that said points 13 may make engagement with theobject to be bored in advance of the cutting edges. The outer points ofthe blades are slightly elevated above the horizontal plane of the heelpoints so as to give proper clearance in a. cutting operation, 1 kandthe size or cutting diameter of the blades are governed by the size ofthe anger or hole to be drilled. Each wing member 6 has a central hole14 for a clamping bolt 15 which extends through a like hole 16 in thelower end of the anger, and is provided with a suitable nut 17.

Preparatory to applying or clamping the bit members, the end of anordinary miners anger is flattened and swaged as at 20, so as to thickenthe spiral edges adjacent to the d straight flattened end of the auger.The bit members are placed in position on opposite sides of the augerand the clamping bolt. and nut operated to rigidly secure the members tothe auger.

It will be seen that the shoulders 8, of the bit members, are of suchwidth as to overlap the end of the auger so that the projecting shoulderof one member forms an abutment for the edge 7 of the other member. Itwill also be noted that the side edges of the bit members are held lushwith the thickened sides of the auger, and that the protruding portionof the shoulders and the bit portion engaging the same are flush.

\Vhen the bit members are securely clamped to the anger, the relativeconstruction and arrangement of said members form an interlockingconnection with each other and with the auger, so that there is noliability of loosening or displacement in a drillin operation.

eferring to the modification shown in Fig. 4 of the drawings, the bitmembers may have one or more depressions or countersunk portions as 18which are intended to fit lugs 19 on the faces of the end of the auger,but this is merely a precautionary measure for insuring properadjustment and security.

The expeditious and time-saving application, adjustment and detachment.of this bit is obvious for convenience in rctempering and sharpening thebit members, one of which may become impaired or disabled and removedand replaced without removing the other, and the said members or severalof them may be transported to and from a mine shaft or othermine-drilling position for re pair without transporting or removing theauger from the mine.

I do not wish to be understood as confining my invention to anyparticular size or to an particular metal other than is suitable for thepurpose thereof, nor do I wish to limit the use of the invention to anyparticular boring implement other than to such to which it isapplicable, but reserve the right to make such changes andvariationstherein and in the manufacture and practical applicationthereof as may not. be inconsistent with the appended claims.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is 1. The combination with an anger having aflat bit end, of a two-part detachable bit comprising duplicate.interchangeable mem. bers having securing wings fitting the spiralchannel of the auger adjacent to said end, a shoulder in each of saidmembers abutting against and overlapping said end, cutting bladesprojecting from the shoulders and crossing each other under the saidend, the overlapping portion of the shoulder forming abutments for thesaid wings, and means for clamping the said auger end to and betweensaid wings.

2. A bit-attachment for an anger, includingduplicate bit-members, havingwings conformed to opposite surfaces of the spiral auger-blades andoppositely deflected and curved terminal cutting blades, each bitmemberhaving a shoulder intermediate its wing and blade adapted to abut thebit-end of the auger, and means for securing said bit-members to theauger.

3. A bit-attachement for an auger, including duplicate bit-members havinwings conformed to opposite surfaces of tie spiral auger-blades andoppositely deflected and curved terminal cutting blades, each bitmemberhaving a shoulder intermediate its win and blade adapted to abut thebit-end ot' the auger, said bit-member terminal cut ting blades havingheel-edges crossing each other under the bit-end of the auger, and meansfor securing said bit-members to the au er.

fn witness whereof I hereunto set my hand in the presence of twowitnesses.

FRED MoLAUGI-ILIN.

Witnesses:

Fnnn B. THOMPSON, B. M. WOODDELL.

